<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>my html 4</title>
    <style>
        h2 {
            color: darkblue;
        }
    </style>
</head>
<body>
<h1 style="text-align: center; color: darkgreen;">云计算 NSD1907</h1>
<h2>云计算 NSD1907</h2>
</body>
</html>